There is hard science that lead kills birds other than waterfowl. The studies I have read this past year concentrated on dove and quail. The quail study I read was done on quail near dove fields and showed no lead toxcicity. The dove studies however showed lead toxcicity in birds that had trapped lead in their digestive systems. I believe that a lead ban on dove fields is going to be our next challenge nationwide. Dove being migratory bird, I would expect this to be a national ban.